feat(schedule-tasks): support auto-publish via media accounts

Replace the legacy target_platform string on schedule tasks with a
workspace-aware auto-publish payload (auto_publish + publish_account_ids
JSONB + cover_asset_url + cover_image_asset_id) and migrate the schema,
sqlc queries, generated models, domain struct, ScheduleTaskService DTOs,
and dispatch worker to round-trip the new fields. PromptRuleGeneration
gains a WithPublishJobService hook so executeGeneration can enqueue an
auto-publish job once the article is ready, and worker-generate wires
the publish-job service in. On the admin-web side, extract
PublishArticleModal's account-card builders into a shared
publish-account-cards module, rebuild GenerateTaskDrawer's schedule
mode around account selection plus a CoverPickerModal, and surface the
new "auto publish" column on ScheduleTaskTab. Shared types and i18n
strings cover the new fields.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/admin-web/src/i18n/messages/en-US.ts

@@ -1254,10 +1254,20 @@ const enUS = {
       platformUnauthorized: "Unauthorized",
       platformEmptyTitle: "No publish platforms",
       platformEmptyHint: "No platform data is available yet. Please verify the Media Management setup first.",
+      publishSection: "Publish Settings",
+      autoPublish: "Auto publish",
+      autoPublishHint: "When enabled, scheduled articles enter the publish queue after generation.",
+      publishAccounts: "Media accounts",
+      publishAccountsHint: "Choose specific accounts. Offline clients queue first and continue after reconnecting.",
+      publishAccountEmptyTitle: "No media accounts",
+      publishAccountEmptyHint: "Bind media accounts in the desktop client before configuring auto publish.",
       cover: "Cover image",
       coverHint: "Keep the cover clear, complete, and visually polished.",
+      scheduleCoverHint: "Cover is off by default. Enable it to save a cover to generated articles for publishing.",
+      scheduleCoverRequiredHint: "A selected account platform requires a cover image before publishing.",
       coverUpload: "Upload cover image",
       coverUploadHint: "Local preview only for now",
+      scheduleCoverUploadHint: "Choose from local files or the asset library",
       scheduleTime: "Schedule article generation",
       scheduleEveryDay: "Every day",
       enableWebSearch: "Enable web search for generation",
@@ -1276,7 +1286,9 @@ const enUS = {
       name: "Task name",
       rule: "Prompt rule",
       cron: "Frequency",
-      platform: "Target platform",
+      autoPublish: "Auto publish",
+      manualPublish: "Manual publish",
+      autoPublishAccountCount: "Auto · {count} accounts",
       nextRun: "Next run",
       startAt: "Start time",
       endAt: "End time",
@@ -1341,6 +1353,8 @@ const enUS = {
       missingPromptRule: "Choose a prompt first.",
       invalidGenerateCount: "Article count must be at least 1.",
       invalidScheduleTime: "Choose a valid schedule time.",
+      missingPublishAccounts: "Choose at least one media account when auto publish is enabled.",
+      missingScheduleCover: "A selected media account platform requires a cover image.",
       missingPromptName: "Enter a prompt name first.",
       missingPromptContent: "Enter prompt content first.",
     },

apps/admin-web/src/i18n/messages/zh-CN.ts

@@ -91,6 +91,7 @@ const zhCN = {
   },
   auth: {
     welcomeBack: "欢迎回来",
+    tenantAdminLogin: "租户后台登录",
     loginAndEnter: "登录并进入工作台",
     email: "邮箱",
     loginIdentifier: "手机号 / 邮箱",
@@ -597,7 +598,7 @@ const zhCN = {
       publishing: "发布中",
       success: "发布成功",
       failed: "发布失败",
-      partial_success: "部分成功",
+      partial_success: "部分发布",
       published: "发布成功",
       publish_success: "发布成功",
       publish_failed: "发布失败",
@@ -1263,10 +1264,20 @@ const zhCN = {
       platformUnauthorized: "未授权",
       platformEmptyTitle: "暂无发布平台",
       platformEmptyHint: "当前还没有可用的平台数据，请先检查媒体管理配置。",
+      publishSection: "发布设置",
+      autoPublish: "是否自动发布",
+      autoPublishHint: "开启后，定时生成完成的文章会使用指定媒体账号自动进入发布队列。",
+      publishAccounts: "媒体账号",
+      publishAccountsHint: "请选择具体账号。客户端离线时会先排队，上线后继续发布。",
+      publishAccountEmptyTitle: "暂无可选媒体账号",
+      publishAccountEmptyHint: "请先在桌面端绑定媒体账号，再回到这里配置自动发布。",
       cover: "封面图",
       coverHint: "请保证封面清晰、美观和完整",
+      scheduleCoverHint: "默认不设置封面。需要时可单独指定，生成完成后会写入文章并用于发布。",
+      scheduleCoverRequiredHint: "已选账号的平台要求发布封面，请先选择封面图。",
       coverUpload: "上传封面图",
       coverUploadHint: "当前仅做本地预览",
+      scheduleCoverUploadHint: "从本地或素材库选择",
       scheduleTime: "定时生成文章",
       scheduleEveryDay: "每天",
       enableWebSearch: "生成文章联网搜索",
@@ -1285,7 +1296,9 @@ const zhCN = {
       name: "任务名称",
       rule: "关联规则",
       cron: "执行频率",
-      platform: "目标平台",
+      autoPublish: "自动发布",
+      manualPublish: "手动发布",
+      autoPublishAccountCount: "自动 · {count} 个账号",
       nextRun: "下次执行",
       startAt: "开始时间",
       endAt: "结束时间",
@@ -1350,6 +1363,8 @@ const zhCN = {
       missingPromptRule: "请先选择 Prompt",
       invalidGenerateCount: "生成篇数至少为 1",
       invalidScheduleTime: "请选择有效的定时时间",
+      missingPublishAccounts: "开启自动发布后，请至少选择一个媒体账号",
+      missingScheduleCover: "已选媒体账号的平台要求封面图，请先设置封面",
       missingPromptName: "请先填写 Prompt 名称",
       missingPromptContent: "请先填写 Prompt 内容",
     },